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这个程序运行正常..我的任务是，当名称字段留空（那么请输入您的名字）这个错误将会生成，当我输入错误的输入（如数字）然后（只允许字母和空格）这个错误信息必须被生成。我怎样才能做到这一点。JavaScript表单验证为空字段和错误的输入
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Validation tutorial</title>
<script>
function validateName(x){
// Validation rule
var re = /[A-Za-z -']$/;
// Check input
if(re.test(document.getElementById(x).value)){
// Style green
document.getElementById(x).style.borderColor ='#3BFF3B';
// Hide error prompt
document.getElementById(x + 'Error').style.display = "none";
return true;
}else{
// Style red
document.getElementById(x).style.borderColor ='#FF0000';
// Show error prompt
document.getElementById(x + 'Error').style.display = "block";
return false;
}
}
// Validate email
function validateEmail(email){
var re = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if(re.test(email)){
document.getElementById('email').style.borderColor ='#3BFF3B';
document.getElementById('emailError').style.display = "none";
return true;
}else{
document.getElementById('email').style.borderColor ='#FF0000';
return false;
}
}
// Validate Select boxes
function validateSelect(x){
if(document.getElementById(x).selectedIndex !== 0){
document.getElementById(x).style.borderColor ='#3BFF3B';
document.getElementById(x + 'Error').style.display = "none";
return true;
}else{
document.getElementById(x).style.borderColor ='#FF0000';
return false;
}
}
function validateRadio(x){
if(document.getElementById(x).checked){
return true;
}else{
return false;
}
}
function validateCheckbox(x){
if(document.getElementById(x).checked){
return true;
}
return false;
}
function validateForm(){
// Set error catcher
var error = 0;
// Check name
if(!validateName('name')){
document.getElementById('nameError').style.display = "block";
error++;
}
// Validate email
if(!validateEmail(document.getElementById('email').value)){
document.getElementById('emailError').style.display = "block";
error++;
}
// Validate animal dropdown box
if(!validateSelect('subject')){
document.getElementById('subjectError').style.display = "block";
error++;
}
// Validate Radio
if(validateRadio('male')){
}else if(validateRadio('female')){
}else{
document.getElementById('genderError').style.display = "block";
error++;
}
// Don't submit form if there are errors
if(error > 0){
return false;
}
}
</script>
</head>
<body>
<form action="" onsubmit="return validateForm()">
<label for="name">Name</label>
<input type="text" name="name" id="name" onblur="validateName(name)" />
<span id="nameError" style="display: none;">only alphabates and white space are allowed</span>
<br><br>
<label for="email">Email</label>
<input type="text" name="email" id="email" onblur="validateEmail(value)" />
<span id="emailError" style="display: none;">You must enter a valid email address</span>
<br><br>
<label for="hand">Gender</label>
<ul>
<li>
<input type="radio" name="gender" id="male" value="male" onblur="validateRadio(id)" />
<label for="left">male</label>
</li>
<li>
<input type="radio" name="gender" id="female" value="female" onblur="validateRadio(id)" />
<label for="right">female</label>
</li>
</ul>
<span class="validateError" id="genderError" style="display: none;">Please select gender</span>
<br><br>
<label for="subject">Favourite Subject</label>
<select name="subject" id="subject" onblur="validateSelect(name)">
<option value="">SUBJECTS</option>
<option value="php">PHP</option>
<option value="java">JAVA</option>
<option value="sql">SQL</option>
</select>
<span class="validateError" id="subjectError" style="display: none;">You must select your favourite subject</span>
<br><br>
<input type="submit" id="submit" name="submit" value="Submit" />
</form>
</body>
</html>
在问一个已经回答了100万次的问题之前做一些研究。 [检查这里]（http://www.w3schools.com/js/js_validation.asp）有一个简单的例子，我所做的只是搜索。 – Theunis
没有这是与php –
@Theunis我研究了所有这一切，但我是新的JavaScript的所以这就是为什么问这个问题..如果你知道答案，然后回复我..其迫切.. –